Remap printscreen?

So I've got Ubuntu MATE 20.04 LTS installed on an old MacBook Air. I can use the screenshot tool, but would prefer to use something like printscreen to take one instantly.

Thing is, Mac doesn't really use a printscreen key. I know that under Windows, the F14 key can be used, but this MBAir doesn't have one of those, either.

I'm thinking of mapping screenshots to F3, if I can. Is there a way to do that?

Nevermind. I found Keyboard Shortcuts in the applications menu. =) It's been awhile since I've tried using a Linux distro as a perminant install, and I'm still learning my way around.

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